| 单词 |
celsian |
| 释义 |
celsian, n. Min.
Brit. |ˈsɛlsɪən|, U.S. |ˈsɛlsiən|
[‹ Swedish celsian (H. Sjögren 1895, in Geol. Föreningens i Stockholm Förhandl. 17 579) > n. and adj.) + -an -an suffix.]
A colourless, white, or pale yellow mineral of the monoclinic crystal system which is a barium-containing feldspar, BaAl2Si2O8, dimorphous with paracelsian and occurring mostly in association with manganese deposits.
1897Mineral. Mag. 11 325 A list of new mineral names... Celsian. H. Sjögren... Barium anorthite... Sweden. 1907Mineral. Mag. 14 406 Paracelsian..is near to celsian..in composition and optical characters, but..possessing only poor cleavage. 1934Proc. Royal Soc. (A.) 14591 The potassium and barium ions in orthoclase, hyalophane and celsian are surrounded by six oxygen atoms at 2·85 A. and four at 3·1 A. 1995Glass (Nexis) July s2 Sol-gel barium osumilite..was the dominant phase after 3h at 1200°C. Despite this, small amounts of celsian, hexacelsian and cordierite were present even after prolonged heat treatment. |
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